There are many forms of water outlet, and the common ones are one-shaped, eight-shaped and door-shaped. The position, form and velocity of the outlet of the drainage channel should be determined according to the drainage quality, downstream water use, the range of water flow and water level change, dilution and self-purification ability, water flow direction, wave conditions, terrain change and meteorology. With the consent of the local health authorities and shipping management departments, measures such as scour prevention, energy dissipation and reinforcement should be taken at the joint between the water outlet and the waterfront, and slurry block stones are generally used to protect the wall and lay the bottom. In areas affected by frost heaving, the outlet should be made of frost heaving resistant materials, and its foundation must be set below the freezing line.
The water pipe is a water supply pipe. Modern decoration water pipes are built by burying walls. There are three types of water pipes. The first category is metal pipes, such as hot-dip cast iron pipes lined with plastic, copper pipes and stainless steel pipes. The second type is plastic-coated metal pipes, such as steel-plastic composite pipes and aluminum-plastic composite pipes. The third category is plastic pipes, such as PB pipes and PP-R pipes.